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Test: Combustion & Flame- 1


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10 Questions MCQ Test Science & Technology for UPSC CSE | Test: Combustion & Flame- 1

Test: Combustion & Flame- 1 for UPSC 2022 is part of Science & Technology for UPSC CSE preparation. The Test: Combustion & Flame- 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Combustion & Flame- 1 MCQs are made for UPSC 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Combustion & Flame- 1 below.
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Test: Combustion & Flame- 1 - Question 1

Gas necessary for combustion is:

Detailed Solution for Test: Combustion & Flame- 1 - Question 1

Combustion takes place only in presence of oxygen. Oxygen supports the combustion of substances in which heat is evolved.

Test: Combustion & Flame- 1 - Question 2

Combustion is a _____ chemical reaction:

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Burning of any substance in presence of oxygen is called combustion. During combustion heat is evolved so, combustion is exothermic chemical reaction in which new substance is formed.

Test: Combustion & Flame- 1 - Question 3

Substance that burns in oxygen to produce heat and light is called :

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Those substances that burn in presence of oxygen to produce heat and light is called combustible substance. Fossil fuels, wood, paper etc are example of combustible substance.

Test: Combustion & Flame- 1 - Question 4

Substance that does not burn in air is :

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The substance that does not burn in air is called non combustible substance. Wood, kerosene and diesel is example of combustible substance but sand is non combustible.

Test: Combustion & Flame- 1 - Question 5

Which fuels are used for running automobiles?

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Diesel is more combustible than these fuels,it releases energy rapidly.

Test: Combustion & Flame- 1 - Question 6

Cutting trees at large scale leads to :

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Cutting of trees at large scale leads to deforestation. Deforestation may cause desertification and loss of living natural resources.

Test: Combustion & Flame- 1 - Question 7

Amount of heat energy produced on complete combustion of 1kg of fuel is called :

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The amount of heat energy released on complete combustion of 1 kg of fuel is called calorific value of that fuel. Higher the calorific value better the fuel is considered.

Test: Combustion & Flame- 1 - Question 8

Substance which vaporise during burning forms :

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Substance which get vaporise during combustion or burning forms flame. Each substance forms characteristic flame having different colour and heat region.

Test: Combustion & Flame- 1 - Question 9

Combustion is also called :

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Combustion is also called as burning. Burning of substance requires oxygen and combustible substance and ignition temperature.

Test: Combustion & Flame- 1 - Question 10

Lowest temperature at which a substrate catches fire is called its :

Detailed Solution for Test: Combustion & Flame- 1 - Question 10

The lowest temperature at which substance catch fire is called ignition temperature. The fuel with moderate temperature is considered better fuel for domestic use.

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